Fixed design lm317

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Eevblog #221 - lab power supply design - part 1

PART 2 is HERE: www.youtube.com Dave shows you how to design a simple constant current and constant voltage lab power supply that can be either software (PIC/AVR et.al microcontroller) or traditional pot controlled. Starting with the venerable LM317, and ending up with an LT3080 solution, and the some thought processes that go into it all. Part 1 is the conceptual design of this Open Hardware design.
Category: Science & Technology
Length: 00:28:15.750
Tags: laboratory bench power supply variable fixed design lm317 schematic build concept circuit Electronics Technology .

Adjustable voltage stabilizer

Adjustable Voltage Stabilizer An adjustable voltage stabilizer is an integral part of a modern radio electronic device. The voltage stabilizers most commonly used for this application are integrated voltage stabilizers - or integrated circuits. In most cases these are microchips designed for a standard fixed voltage value. However, some cases require voltage that is different from the standard one. Or we might need a power source with adjustable output voltage. Such power source can be assembled using a microchip - an adjustable voltage stabilizer, say, LM317. This microchip is offered be many producers and in different configurations, for various load currents, and, respectively, in a variety of cases - from SO-8 to ТО-3. The standard microchip connection circuit is very simple and requires just a small number of additional elements. The power unit consists of a step-down transformer, a diode bridge and evening capacities. An input capacitor needs to be connected to eliminate high-frequency generation in step-like connection of input voltage. The output capacitor provides stability in pulse changes of the load current and decreases the level of pulsation. The output voltage is adjusted using a variable resistor, which forms a bleeder together with the fixed resistor R1. By changing the resistance of a variable resistor we control the output voltage, according to the formula. 1.25 coefficient in this formula is the value of voltage reference. This device will help you ...
Category: Science & Technology
Length: 00:01:32.250
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Diy variable power supply

Make your own variable power supply! www.instructables.com
Category: Howto & Style
Length: 00:00:41.250
Tags: variable power supply cheap easy .

Amplificador/amplifier diy - "af 3.0" - 4x tda 7294-with english subtitles (cc)

Este é a terceira versão do meu ampli DIY feito com TDA 7294. É alimentado com um trafo de 2x33 Volts / 500VA, comprado na "Toroid do Brasil". Foi usado uma ponte retificadora KBPC2510 da "Guerte". Banco de capacitores 5x 4700uF, 1x 10.000uF. Foi usada o esquema e PCB do datasheet do TDA7294, com pequenas mudanças nas trilhas, não sendo removido/adicionado/modificado nenhum componente. OBS.: no TDA7294 possui a opção de stand-by/mute, que por eu não usar, liguei-os direto na alimentação positiva (Vs+).O jumper J1, liguei o pino central ao GND (pino direito). 2 x potenciômetros de 100K, um para cada canal, um para cada 2x placas. 2x coolers 12V de fonte de PC. English: This is the third version of my DIY amp made with TDA 7294. It is powered by a transformer from 2x33 volt / 500VA, purchased from "Toroid do Brazil". Was used a bridge rectifier KBPC2510 "Guerte". The "bank" of Capacitor its 5x 4700uF, 1x 10.000uF. Was used the PCB layout and the datasheet of the TDA7294, with small changes in the tracks not being removed / added / changed any components. OBS.: In TDA7294 has the option stand-by/mute , I have not used, I linked them straight in the positive supply (+Vs). The J1 jumper connected the center pin to GND (right pin). 2 x 100K pots, one for each channel, one for each 2x PCB. 2x coolers 12V, removed from a PC power supply.
Category: Entertainment
Length: 00:10:00
Tags: amplificador amplifier .

Diy: how to make a high powered burning blue/violet laser pointer

The video shows you how to build a high powered burning violet laser (reason why it says Blue/Violet in title is because half the things you point the violet laser at fluoresce and cause the dot to turn blue) For written tutorial go here: styropyro.com Parts List: PHR-803T sled- www.modwerx.com 101mA Driver- Driver in video is no longer sold, so here is a very similar driver. Choose "preset current" and type 110mA in the box. There is no need for the glass lens. link: hacylon.case.edu Aixiz Module- www.modwerx.com or (2-pack) stonetek.org Helpful Notes: For extra output, cut out the plastic on the back of the lens This set up should yield you just under 100mW of 405nm (violet) light, easily enough to burn. DO NOT "test" the laser diode by hooking it up to a 9v battery, if you do you will break your laser NEVER EVER point this laser in yours or somebody else's eyes, the wavelength of this light is more energetic then most visible light so a hit in the eye will damage your eyesight! Also do not stare at the dot from up close with out proper protection, if you stare at the dot too much when burning things your eyesight could get damaged. Buy laser goggles!
Category: Science & Technology
Length: 00:02:29.250
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